package com.example.demo.thread.juc;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * @Description: 线程之间通信
 * @Author: LLL
 * @Date: 2020-03-20 11:09
 **/

class ShareResource {

    /**
     * A:1 B:2 C:3
     */
    private int number = 1;

    // 判断 干活 通知
    private Lock lock = new ReentrantLock();

    private Condition c1 = lock.newCondition();

    private Condition c2 = lock.newCondition();

    private Condition c3 = lock.newCondition();

    public void print5() {
        lock.lock();
        try {
            // 判断
            while (number != 1) {
                c1.await();
            }
            // 干活
            for (int i = 1; i <= 5; i++) {
                System.out.println(Thread.currentThread().getName() + "\t" + i);
            }
            // 通知 精准通知
            number = 2;
            c2.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

    public void print10() {
        lock.lock();
        try {
            // 判断
            while (number != 2) {
                c2.await();
            }
            // 干活
            for (int i = 1; i <= 10; i++) {
                System.out.println(Thread.currentThread().getName() + "\t" + i);
            }
            // 通知 精准通知
            number = 3;
            c3.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

    public void print15() {
        lock.lock();
        try {
            // 判断
            while (number != 3) {
                c3.await();
            }
            // 干活
            for (int i = 1; i <= 15; i++) {
                System.out.println(Thread.currentThread().getName() + "\t" + i);
            }
            // 通知 精准通知
            number = 1;
            c1.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

}

public class SyncAndReentrantLock {
    public static void main(String[] args) {
        ShareResource resource = new ShareResource();
        new Thread(() -> {
            resource.print5();
        }, "A").start();
        new Thread(() -> {
            resource.print10();
        }, "B").start();
        new Thread(() -> {
            resource.print15();
        }, "C").start();
    }
}
